The coordinated attacks in this predominantly Sunni city – the deadliest fallout from Syria’s civil war to hit Lebanon – raised sectarian tensions to dangerous levels amid fears the country was slipping into a prolonged cycle of revenge.

Additional Photos

A man recites prayers amid the destruction after a car bomb exploded outside the Al-Taqwa mosque in the northern city of Tripoli, Lebanon, on Friday. The Associated Press

The blasts marked the second such attack in just over a week. A deadly car bombing targeted an overwhelmingly Shiite district south of Beirut controlled by the militant Hezbollah group on Aug. 15, demonstrating the alarming degree to which the country is being torn apart by the civil war next door.

Friday’s attacks shocked residents of Tripoli, which has been the scene of frequent clashes between supporters and opponents of President Bashar Assad in recent months. But the city, Lebanon’s second-largest, has not seen such bombings in decades.

The blasts were clearly intended to cause maximum civilian casualties, timed to go off at midday Friday outside the Taqwa and Salam mosques, which are known to be filled with worshippers at that time on the Muslim day of prayer.

“Lebanon has officially entered the regional war which has been raging in Syria and Iraq,” said Randa Slim, a scholar at the Washington-based Middle East Institute.

“There are serious fears that the country has entered a vicious cycle of tit-for-tat explosions and car bombs. A dynamic of violence and reprisals, once set in, is hard to reverse,” she said.

In one video, apparently recorded by a closed-circuit television camera in the area, scores of terrified worshippers were seen spilling out of one of the mosques in a crushing stampede immediately after the explosion struck.

In the chaotic aftermath, bearded gunmen took to the streets of Tripoli, firing in the air, attacking soldiers and sealing off the two mosques where the car bombs went off. Later, they roamed the streets in SUVs, weapons sticking out of the windows.

The two explosions went off about five minutes apart. The force of the blast at the Taqwa mosque propelled a car onto its roof.

President Michel Suleiman cut short a visit abroad and returned to the country to follow the situation. He described the attacks as a “massacre” aimed at sowing strife among Lebanese.

Hezbollah was quick to condemn the bombings and in a strongly worded statement, expressed “utmost solidarity” with the people of Tripoli.

However, residents of the city – long known as a hotbed for Sunni fundamentalists – were quick to point fingers at the Syria-backed group, blaming it for bringing destruction to Lebanon because of its open involvement in the Syrian civil war. In an ominous sign, a prominent Salafist sheikh, Dai al-Islam Shahhal, said Sunnis in Tripoli would take security in their own hands, raising the specter of armed vigilantes.

“Hassan Nasrallah was behind this,” a man shouted hysterically at the scene, blaming the Hezbollah leader.

The grand mufti, Lebanon’s top Sunni cleric, urged calm and unity in a televised address, but there was little of that to be seen in Tripoli on Friday.

The open participation of the group on behalf of the embattled Assad regime has sent sectarian tensions soaring in Lebanon, a deeply divided country that never fully recovered from its own devastating civil war, which ended in 1990.

During that conflict, which pitted Christians against Muslims, tit-for-tat car bombings were common and contributed to the estimated 150,000 people killed during the 15-year conflict. Since the end of the war, there have been numerous car bombings targeting politicians and journalists, but attacks intended to cause civilian casualties have been rare.

The Syrian civil war, and Hezbollah’s military involvement in support of Assad’s forces, has rekindled the polarization along sectarian lines and street clashes have erupted on numerous occasions.

Attacks have become common in the past few months against Shiite strongholds in Lebanon, in what many see as retaliation by extremist groups for Hezbollah’s role in Syria. The Aug. 15 car bombing in a Shiite stronghold of Hezbollah in the southern suburbs of Beirut killed 27 people and wounded more than 300. A less powerful car bomb targeted the same area on July 9, wounding more than 50.

Hezbollah’s leader has blamed those attacks on so-called Takfiri groups, a term used to refer to Sunni radicals. He predicted in a speech last week that such fanatic groups would not stop at attacking Shiites but would also kill Sunnis and Christians.

The bombings Friday in Tripoli were the city’s most powerful and deadliest since the end of the civil war and the first such attacks to target Sunnis in Lebanon. Preachers at both of the targeted mosques are virulent opponents of Assad and Hezbollah.

There was no immediate claim of responsibility.

Samir Darwish said he was in a Tripoli square when he heard the first explosion and ran in the direction of the fire to the Salam mosque.

“I came here and saw the catastrophe. Bloodied people were running in the street, several other dead bodies were scattered on the ground,” he said. “It looked like doomsday. Death was everywhere.”

A bus driver Mahmoud Saeed, 37, was praying inside the Taqwa mosque when the explosion erupted.

“I walked out and saw charred bodies in the street. We were in a state of shock and fear,” said Saeed whose white and blue shirt was stained with the blood of a wounded man he helped after the blast.

At Islamic Hospital a list of 51 names was put on the door of the emergency room. Nurses said they were of the dead and wounded. A nurse at the hospital said most of the bodies brought in were burned beyond recognition and could only be identified with DNA tests. She spoke on condition of anonymity because she was not authorized to give official statements.

Hezbollah condemned the “terrorist bombings,” saying it was part of a “criminal project that aims to sow the seeds of civil strife between the Lebanese and drag them into sectarian and ethnic infighting.”

In a strongly worded statement, the group expressed “utmost solidarity and unity with our brothers in the beloved city of Tripoli.”

The bombings came the same day Israeli warplanes struck a target south of Beirut, hours after militants in south Lebanon fired four rockets into northern Israel. It was the first air raid on the area since the 2006 war between Israel and Hezbollah. The strike demonstrates the chaos and security challenges engulfing Lebanon, which has been without a functioning government since March, largely because of infighting between political factions.

Slim, the analyst, said a widespread civil war in Lebanon is still unlikely at this point, but predicted a further weakening of state institutions and a widening trust deficit between Lebanon’s communities.

“Until the Syrian conflict reaches its conclusion, instability and periodic violence will be the order of the day in Lebanon,” she said.

Caretaker Prime Minister Najib Mikati declared Saturday to be a national day of mourning for the dead.

The U.S. Embassy in Lebanon condemned the bombings and called on all parties to exercise calm and restraint.

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